CN104237141B - A kind of spectrum beam splitting measuring method for Supercontinuum source and device - Google Patents
A kind of spectrum beam splitting measuring method for Supercontinuum source and device Download PDFInfo
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- CN104237141B CN104237141B CN201410504608.8A CN201410504608A CN104237141B CN 104237141 B CN104237141 B CN 104237141B CN 201410504608 A CN201410504608 A CN 201410504608A CN 104237141 B CN104237141 B CN 104237141B
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- 238000001228 spectrum Methods 0.000 title claims abstract description 40
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- 230000000875 corresponding Effects 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 abstract description 12
- 230000003595 spectral Effects 0.000 abstract description 10
- 239000000835 fiber Substances 0.000 description 7
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- 238000001069 Raman spectroscopy Methods 0.000 description 1
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Abstract
A kind of spectrum beam splitting measuring method for Supercontinuum source and device, use three optical fiber collimators and a long wave pass filter or short wave pass filter, the super continuum light spectrum that Supercontinuum source is exported by tail optical fiber is collimated by an optical fiber collimator, and then be incident on long wave pass filter or short wave pass filter, cutoff wavelength according to long wave pass filter or short wave pass filter is divided into long wave and two parts of shortwave by long wave pass filter or short wave pass filter transmission or reflection, the two-way light that transmission or reflection goes out respectively is coupled in determinand through an optical fiber collimator, the transmitted spectrum of determinand measured the most respectively by two spectrogrphs being respectively adopted corresponding range again.Present invention achieves and use grating spectrograph to carry out the seamless measurement of ultra broadband in the whole spectral region of Supercontinuum source simultaneously.Assembly of the invention need not regulate light path before every measurement and changes different narrow band pass filters, the most time saving and energy saving, reduces cost, adds again stability and the reliability of device.
Description
Technical field
The present invention relates to a kind of spectrum beam splitting measuring method and device.Particularly relating to one utilizes bulk optics device by super continuum light
Compose long short wavelength components and be split so that the spectrum beam splitting for Supercontinuum source that measures in whole spectral region simultaneously
Measuring method and device.
Background technology
Light pulse transmitting procedure in nonlinear dielectric, not only by such as Self-phase modulation (SPM), Cross-phase Modulation
(XPM) the multiple non-thread such as, four-wave mixing (FWM), stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS)
The impact of property effect, is also affected by Dispersion of Media characteristic.Under the common effect of nonlinear effect and dispersion, new frequency
Component is produced.For sufficiently strong pulse, its spectrum can be more than broadened hundreds of nanometers, and this phenomenon is super even
The generation of continuous spectrum.
Supercontinuum source can export ultra-wide spectrum laser, its in biology, medical science, physics, national defence and industry etc. to low-coherence light source
Or spectrum analysis has on the field of high request and has important application.In spectroscopy applications, owing to Supercontinuum source can be defeated
Go out the widest spectrum more than octaves the most several, so a Supercontinuum source just can instead front several different-wavebands
Narrow-band light source, enormously simplify the complexity of system source.
But, in terms of spectral measurement from the point of view of, the equipment that present stage mainly uses is grating spectrograph.Relative to Supercontinuum source
Spectral bandwidth for, the range of grating spectrograph is extremely limited, about generally one octave, such as: two kinds of conventional light
The range of grating spectrograph is respectively 600-1700nm and 1200-2400nm.Particularly close to 2 micron wavebands of middle infrared,
Almost only having range on market is that this kind of spectrogrph of 1200-2400nm is available.
According to grating equationUnderstanding, rudimentary diffraction of long wavelength light signal will be believed with short-wavelength light
Number corresponding senior diffraction be completely superposed, it is impossible to separately.Such as: wavelength is that the light of 2100nm enters to inject in grating spectrograph,
Its first-order diffraction can with wavelength be the second-order diffraction of 1050nm light, wavelength be three order diffractions and the most more of 700nm light
The higher level of short wavelength time diffraction light is completely superposed.Even if its consequence be actually do not have 2100nm light enter spectrogrph and
Only having the above-mentioned short-wavelength light mentioned and enter in spectrogrph, spectrogrph also can show and recorded the optical signal that wavelength is 2100nm,
Thus cause measurement error.
Further, existing Supercontinuum source is used mostly and is operated in the Yb dosed optical fiber mode-locked laser of 1 micron waveband as kind
Sub-light source, amplified pumped nonlinear optical fiber produces super continuum light spectrum.This makes the shortwave part especially 1 that super continuum light is composed
The light intensity of micron waveband is better than long wavelength part.In addition the shortwave part of super continuum light spectrum has been significantly shorter than the short-wavelength limit of spectrogrph range
1200nm.Final result is to use both common effect at 1 stronger micron waveband optical signal and outranging of spectrogrph
Under, the long wavelength part of measurement result, especially at 2 micron wavebands, above-mentioned measurement error is typically further exacerbated.
At present, when applying Supercontinuum source to carry out spectroscopy applications, solve the main method of the problems referred to above according to application
Wave band uses corresponding narrow band pass filter to leach corresponding spectral component.But, the inferior position of this method is also apparent from.
On the one hand, it is in the spectral component in narrow band pass filter rejection zone will be lost completely, it is impossible to application.This not only significant wastage
The spectral width of Supercontinuum source, also weakens the advantage for its relatively traditional narrow light source.On the other hand, super in order to meet
The demand of wide-band width measurement, such scheme must need several narrow band pass filter, not only increases the cost of device, and the most more
Change narrow band pass filter to be required for readjusting light path, waste time and energy.
Such as: measure in the application of fiber grating, if there being centre wavelength to be respectively 1.5 microns and 2 utilizing Supercontinuum source
Two fiber gratings of microns need to measure.Reserve centre wavelength is needed to be respectively 1.5 microns and 2 according to above-mentioned solution
Two narrow band pass filters of micron are measured at twice, and are required for readjusting light path before each measurement.
Summary of the invention
The technical problem to be solved is to provide one and can make full use of the whole wave band of Supercontinuum source and survey in real time
Amount, need not to regulate before every measurement light path and change different narrow band pass filters, and can increase device stability and
The spectrum beam splitting measuring method for Supercontinuum source of reliability and device.
The technical solution adopted in the present invention is: a kind of spectrum beam splitting measuring method for Supercontinuum source, uses three optical fiber
Collimator and a long wave pass filter or short wave pass filter, the super continuum light that Supercontinuum source is exported by tail optical fiber is composed by one
Individual optical fiber collimator is collimated, and then is incident on long wave pass filter or short wave pass filter, according to long wave pass filter or short
The cutoff wavelength of ripple pass filter is divided into long wave and two parts of shortwave by long wave pass filter or short wave pass filter transmission or anti-
Penetrating, the two-way light that transmission or reflection goes out respectively is coupled in determinand through an optical fiber collimator, then be respectively adopted correspondence
The transmitted spectrum of determinand measured the most respectively by two spectrogrphs of range.
The cutoff wavelength of described long wave pass filter or short wave pass filter is more than measuring the range of spectrogrph used by long wavelength part spectrum
Short-wavelength limit.
A kind of device for the spectrum beam splitting measuring method for Supercontinuum source, includes the first optical fiber collimator, the second light
Fine collimator, the 3rd optical fiber collimator and long wave pass filter or short wave pass filter, the light of the first described optical fiber collimator enters
Penetrating end and connect Supercontinuum source by optical fiber, described long wave pass filter or short wave pass filter are arranged on described first fiber optic collimator
On the output light path of device, described second optical fiber collimator is arranged on the reflected light path of described long wave pass filter or short wave pass filter
On, described 3rd optical fiber collimator is arranged on the transmitted light path of described long wave pass filter or short wave pass filter, described
The light output end of two optical fiber collimators connects the first determinand, and it is to be measured that the light output end of the 3rd described optical fiber collimator connects second
Thing, the light output end of described first determinand connects the first spectrogrph, and the light output end of described second determinand connects the second spectrum
Instrument.
The cutoff wavelength of described long wave pass filter or short wave pass filter is more than using long wave pass filter or short-pass optical filtering respectively
For measuring the second spectrogrph of long wavelength part spectrum or the range short-wavelength limit of the first spectrogrph during sheet.
A kind of spectrum beam splitting measuring method for Supercontinuum source of the present invention and device, not only take full advantage of Supercontinuum source
Whole spectral bandwidth so that simultaneously measure different-waveband determinand spectrum be possibly realized；Achieve at Supercontinuum source whole
Use grating spectrograph to carry out the seamless measurement of ultra broadband in spectral region simultaneously.Use assembly of the invention also without surveying every time
Regulate light path before amount and change different narrow band pass filters, the most time saving and energy saving, reduce cost, add again the stability of device
And reliability.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention；
Fig. 2 is the result that the first testing fiber grating measuring of 1.5 micron wavebands is obtained by the first spectrogrph；
Fig. 3 is the result that the second testing fiber grating measuring of 2 micron wavebands is obtained by the second spectrogrph.
In figure
1: the first optical fiber collimator 2: the second optical fiber collimator
3: the three optical fiber collimators 4: long wave pass filter or short wave pass filter
5: the first determinand 6: the second determinands
7: the first spectrogrph 8: the second spectrogrphs
9: Supercontinuum source 10: optical fiber
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, a kind of spectrum beam splitting measuring method for Supercontinuum source and the device of the present invention are made
Describe in detail.
A kind of spectrum beam splitting measuring method for Supercontinuum source of the present invention and device, by bulk optics device by super continuum light
Spectrum is divided into long shortwave two parts to apply respectively, it is possible to achieve use grating spectrograph in the whole spectral region of Supercontinuum source simultaneously
Carry out ultra broadband this target of seamless measurement.
A kind of spectrum beam-splitting method for Supercontinuum source of the present invention, is to use three optical fiber collimators and a logical filter of long wave
Mating plate or short wave pass filter realize, and the super continuum light that Supercontinuum source is exported by tail optical fiber is composed by an optical fiber collimator
Collimated, and then be incident on long wave pass filter or short wave pass filter, according to long wave pass filter or short wave pass filter
Cutoff wavelength is divided into long wave and two parts of shortwave by long wave pass filter or short wave pass filter transmission or reflection, transmission or reflection
The two-way light gone out is coupled in determinand respectively through an optical fiber collimator again, is finally respectively adopted two spectrum of corresponding range
The transmitted spectrum of determinand measured the most respectively by instrument.Wherein, the cut-off wave of described long wave pass filter or short wave pass filter is grown up
In measuring the range short-wavelength limit of spectrogrph used by long wavelength part spectrum.
As it is shown in figure 1, the device for the spectrum beam-splitting method for Supercontinuum source of the present invention, include the first optical fiber accurate
Straight device the 1, second optical fiber collimator the 2, the 3rd optical fiber collimator 3 and long wave pass filter or short wave pass filter 4, described the
The light incident side of one optical fiber collimator 1 connects Supercontinuum source 9, described long wave pass filter or short-pass by optical fiber 10 and filters
Sheet 4 is arranged on the output light path of described first optical fiber collimator 1, and, described long wave pass filter or short-pass filter
Sheet 4 and the output light path of the first described optical fiber collimator 1, and the reflection light of long wave pass filter or short wave pass filter 4
Road can be arranged to certain angle with the output light path of the first described optical fiber collimator 1 according to measurement needs and filbtercharacteristic
Degree, if the output light path of the first optical fiber collimator is with on the incident angles of 20 degree to long wave pass filter or short wave pass filter 4,
The i.e. reflected light path of long wave pass filter or short wave pass filter 4 is 40 degree with the output light path of the first described optical fiber collimator 1
Angle.
Described second optical fiber collimator 2 is arranged on the reflected light path of described long wave pass filter or short wave pass filter 4, described
3rd optical fiber collimator 3 is arranged on the transmitted light path of described long wave pass filter or short wave pass filter 4, the second described light
The light output end of fine collimator 2 connects the first determinand 5, and the light output end of the 3rd described optical fiber collimator 3 connects second to be treated
Surveying thing 6, the light output end of described first determinand 5 connects the first spectrogrph 7, and the light output end of described second determinand 6 connects
Second spectrogrph 8.The cutoff wavelength of described long wave pass filter or short wave pass filter 4 is more than using long wave pass filter respectively
Or for measuring the second spectrogrph 8 or range short-wavelength limit of the first spectrogrph 7 of long wavelength part spectrum during short wave pass filter 4.
The Supercontinuum source a width of 800-2100nm of output spectrum band that the present invention uses in a particular embodiment, super continuum light spectrum is passed through
Become collimated light through the first reflective optical fiber collimator after tail optical fiber output, and filter to long wave is logical with the incident angles of 20 degree
On sheet.The cutoff wavelength of long wave pass filter is 1700nm, more than measuring the shortwave of grating spectrograph range used by long wavelength part
Limit 1200nm.So, the ultra-wide spectrum of Supercontinuum source output will be divided into two bundles with 1700nm for boundary, 800-1700nm's
Part will be reflected onto in the second optical fiber collimator, and the part of 1700-2100nm will be transmitted through in the 3rd optical fiber collimator.Second
Two-beam is coupled in optical fiber by optical fiber collimator and the 3rd optical fiber collimator respectively, and transmission is to the first determinand and the second determinand.
Finally, measure the first determinand and second with two spectrogrphs that range is 600-1700nm and 1200-2400nm the most simultaneously
The transmitted spectrum of determinand, can respectively obtain result as shown in Figures 2 and 3.First determinand and the second determinand are respectively
It is 1.5 microns and the fiber grating of 2 micron wavebands, the centre wavelength of the two, reflectance and bandwidth etc. can be read from figure
Parameter.First determinand therein and the second determinand can be the transparent objects such as fiber grating, bulk crystals, biological tissue's thin slice
Body.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number is only
Only for describing, do not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all the spirit and principles in the present invention it
In, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (2)
1. the spectrum beam splitting measuring method for Supercontinuum source, it is characterized in that, use three optical fiber collimators and a long wave pass filter or short wave pass filter, the super continuum light spectrum that Supercontinuum source is exported by tail optical fiber is collimated by an optical fiber collimator, and then be incident on long wave pass filter or short wave pass filter, cutoff wavelength according to long wave pass filter or short wave pass filter is divided into long wave and two parts of shortwave by long wave pass filter or short wave pass filter transmission or reflection, the two-way light that transmission or reflection goes out respectively is coupled in determinand through an optical fiber collimator, the transmitted spectrum of determinand measured the most respectively by two spectrogrphs being respectively adopted corresponding range again, the cutoff wavelength of described long wave pass filter or short wave pass filter is more than measuring the range short-wavelength limit of spectrogrph used by long wavelength part spectrum.
null2. one kind described in the claim 1 for the device of spectrum beam splitting measuring method of Supercontinuum source，Include the first optical fiber collimator (1)、Second optical fiber collimator (2)、3rd optical fiber collimator (3) and long wave pass filter or short wave pass filter (4)，It is characterized in that，The light incident side of described the first optical fiber collimator (1) connects Supercontinuum source (9) by optical fiber (10)，Described long wave pass filter or short wave pass filter (4) are arranged on the output light path of described first optical fiber collimator (1)，Described second optical fiber collimator (2) is arranged on the reflected light path of described long wave pass filter or short wave pass filter (4)，Described 3rd optical fiber collimator (3) is arranged on the transmitted light path of described long wave pass filter or short wave pass filter (4)，The light output end of described the second optical fiber collimator (2) connects the first determinand (5)，The light output end of the 3rd described optical fiber collimator (3) connects the second determinand (6)，The light output end of described first determinand (5) connects the first spectrogrph (7)，The light output end of described second determinand (6) connects the second spectrogrph (8)，The output light path of the first optical fiber collimator (1) is with on the incident angles of 20 degree to long wave pass filter or short wave pass filter (4)，The i.e. reflected light path of long wave pass filter or short wave pass filter (4) is 40 degree of angles with the output light path of described the first optical fiber collimator (1).
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| CN201410504608.8A CN104237141B (en) | 2014-09-26 | A kind of spectrum beam splitting measuring method for Supercontinuum source and device |
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| CN201410504608.8A CN104237141B (en) | 2014-09-26 | A kind of spectrum beam splitting measuring method for Supercontinuum source and device |
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| CN104237141B true CN104237141B (en) | 2017-01-04 |
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